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Fracture Energy and Strength Behavior of a Sodium Borosilicate Glass‐Al 2 O 3 Composite System
Author(s) -
LANGE F. F.
Publication year - 1971
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1971.tb16016.x
Subject(s) - borosilicate glass , materials science , composite material , flexural strength , dispersion (optics) , composite number , fracture mechanics , particle size , phase (matter) , fracture (geology) , surface energy , particle (ecology) , chemistry , optics , physics , oceanography , organic chemistry , geology
Fracture energy and strength were determined for three series within a sodium borosilicate glass‐Al 2 O 3 dispersed composite system. The average particle sizes of the Al 2 O 3 dispersions were , and μm. Within each series, composites containing 0.10, 0.25, and 0.40 vol fractions of the Al 2 O 3 dispersed phase were vacuum hot‐pressed. The fracture energy was determined at 77°K with the double cantilever specimen configuration. Strength was measured by a 4‐point flexural test. A significant increase in fracture energy was observed (up to 5 times the fracture energy of the glass without second‐phase dispersion). The fracture energy depended on the interparticle spacing and average particle size of the Al 2 O 3 dispersion. These results could best be explained by a previously proposed model for the interaction of a crack front with a second‐phase dispersion. Surface roughness also contributed to the increased fracture energy. Some composites were strengthened significantly relative to the glass without a dispersion. Calculation of the crack size showed that the Al 2 O 3 dispersion increased the crack size of the glass by ∼1 to 3 times the average particle size of the Al 2 O 3 dispersion. Thus, the dispersion increased both the fracture energy and the crack size. These opposing parameters ultimately determined the strength behavior of these composites.